TL;DR
This review explores the spatial and temporal characteristics of MHD waves in sunspots, their role in flare initiation, and the theoretical models explaining sunspot oscillations, highlighting the connection between wave dynamics and solar activity.
Contribution
It provides a comprehensive overview of the morphology, dynamics, and theoretical understanding of sunspot MHD waves and their relation to solar flares.
Findings
Sunspot oscillations are localized with specific periods and height dependence.
Wave energy influences oscillation frequency transformation.
Magnetoacoustic waves and shocks are key in flare triggering.
Abstract
The review addresses the spatial frequency morphology of sources of sunspot oscillations and waves, including their localization, size, oscillation periods, height localization with the mechanism of cut-off frequency that forms the observed emission variability. Dynamic of sunspot wave processes, provides the information about the structure of wave fronts and their time variations, investigates the oscillation frequency transformation depending on the wave energy is shown. The initializing solar flares caused by trigger agents like magnetoacoustic waves, accelerated particle beams, and shocks are discussed. Special attention is paid to the relation between the flare reconnection periodic initialization and the dynamics of sunspot slow magnetoacoustic waves. A short review of theoretical models of sunspot oscillations is provided.
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